Reversal-regulator for single-phase motors.



D. L. LINDQUIST. REVERSAL REGULATOR FOR SINGLE PHASE MOTORS. ARPLIGATION FILED APR. 26, 1910.

1,085,987, Patented Feb. 3, 1914.

term to the outside mains.

To all whom it may concern UNITED STATES PATENT QFFICE.

DAVID L. LlNDQUlsT, OF YONKERS, NE'W YORK, EiSSIGNOB- TO )TIS ELEVATOR COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION GL NEW JERSEY.

REVERSAL-REGULATGR FOR SINGLE-PFAQE IVIOTGRS.

Specification of Letters Patent.

Patented Feb. 3 1914.

Application filed April :26,v 1910. Serial No. 557,689.

Be it known that 1, DAVID L. LINDQUIS'I, a subject of the King of Sweden, residing at Yonkers, in the county of Westchester and State of New York, have invented a new and useful Improvement in Reversal- Regulators for Single-Phase Motors, of which the following is a specification.

My invention relates to a reversal regulator and it is described in connection with a single phase repulsion induction motor operating an elevator; although it may readily I be adapted for other than elevator apparatus.

One of the objects of my invention is to prevent the motor from receiii'ig clirrent to impel it in a direction opposite to that in which it has been rotating unless the speed of the motor is within certain predetermined limits.

Other objects will appear hereinafter.

In a single phase repulsion-induction motor, the reversal of the motor connections when the motor is running as an induction motor will not affect the direction of rotation of the motor, or effect a reversal of the motor.

My reversal regulator consists of a contact arrangement operative in conjunction with the short-circuiting device of the motor which changes it from a repulsion to an induction motor.

Referring; now -to\ the accompanying drawing,;'t e motor hi is operative to raise and lowelr e elevator car. C and its counterweight by means of the traction drum E. The brake B is operative in the well known manne In connection with the traction drum are found machine limit switches comprising a cam 21 mounted upon a shaft 22 and operative to engage either of the up or down limit switch levers U or I), at the corresponding limit of travel of the elevator car.

A car controller K is located in the elevator car C, and the supplying of current to the motor M is effected by means of the re versing switches R and R and the switch P. The main switch S connects the entire sys- The contact clips 1 and 2 are seem to the housing of the motor M; the contact ring 3 carried by the centrifugal governor 4- is insulated from its supportand is adapted to make connection between the contact clips 1 and 2 when tee said ring; is in a certain position. The centrifugal device t which changes the motor from a repulsion to an induction motor by means of a shortcircuiting device, o connects the contact ring 3 to the motor armature and by its action automatically opens and closes the connection made by the contact ring with the contact clips 1 and 2- in accordance with the speed of the rotating part of themotor, thus making or breaking the circuit through the contact clips 1 and 2 and the contact ring t.

The magnet windings of the reversing, switches R and R are connected through the limit switches D and U and to the contacts of the car controller switch K, so that when the hand lever 5 of the controller switch is moved to the right or left, the corresponding magnet winding: is energized. The magnetwinding of the operating switch P is also connected to the contacts of the car switch K but is dependent for initial energizationupon the position of the contact ring 3. This operating switch P also has contacts 6 and whose function is to main tain acircuit. through the operating switch magnet winding after the said circuit has been initially closed. The opening of either limit switch breaks the circuit through the corresponding reversing switch.

It is not thought necessary to follow in detail the circuits through the reversing switches to the motor, it being suliiciently clear to state that the motor is presumed, in the present embodiment, to be of a single phase type and it being understood that the source of current fro, a the motor contact 8 through the windings ofthe motor to the contact 9 and from the contact-10 through the motor windings to the contact 11.

In order that the operation of my invention may 'be more readily understood, 1 shall describe the perationof the same in connection wit present embodir II" it is denied to'start the n or, the nro'c- :1.

the direction to close switch R E and subsequently the operating switch P. As soon as contact is made with the car switch contact 13 a circuit is closed from the main lt through this car switch contact 13, thence through the conductor 15, magnet winding 16, conductor 17, contact clip 1, contact ring 3, contact clip 2, conductor 18, contact 6, conductor 19 to the other main 2-0. This causes the magnet winding 16 of the operating switch P to be energized, the switch closed, and the auxiliary contacts 6 and 7 to be connected. The connection. of these contacts 6 and 7 causes a holding circuit to be closed through the magnet winding of the operating switch. This circuit is traced from conductor 17, through the contacts 7 and 6, conductor 19 and the main 20 instead of through the contact ring The motor then receives starting current to impel it in a given direction as a repulsion motor and as soon as it mined speed of rotation, the centrifugal device which operates the short-circuiting device and governs the action of the contact ring 3, automatically places this contact ring out or engagement with the fixed contact clips 1 and 52, thereby breaking the 'circuit from conductor 17 to conductor 18; but at this time the operating switch P has been closed and the contacts 6 and 7 maintain a circuit through the magnet winding of the operating switch. Now, if the car operator returns the hand lever 5 to its central position the operating switch P and the reversing switch 1% become deenergized and the motor is stopped in the ordinary manner. But if, instead of. stopping the hand lever at the central position, the car operator swings it past the central position to operate the motor in the opposite direction, a circuit will not be closed to the motor in the reverse direction until the speed of the motor is dropped to a certain predetermined limit. This is evident from the position. of

the \contact ring 8 since it will not make connection between the clips 1 and until the centrifugal device t has allowed it to return to its unoperated position, thus preventing an initial circuit from being closed through the magnet winding of the operating switch. The effect of this is that the connections of the motor can not be reversed while the motor is running as an induction motor. If the connections could be so reversed, the direction of rotation of the motor would remain unchanged, since it is a single phase motor. With my arrangement, however, the movement 01 the hand lever o to either running position effects the to tation of the motor only in the intended. direction; for it it is running as an induction motor it cannot be energized to reverse its direction of rotation until it slows down sufficiently to close the centrifugal rzcrt cimuiting device, thereby again bEL'Olii attains a predeterl l i l repulsion motor, from which condition it may then be started in either direction. The limit switches D and U are inserted in series with the windings oil the reversing switches R and R and are operative to open the circuits thereof when the s id limit switches are automatically L ed.

in elevator apparatus is very frequent desired to reverse the direction of rotation of the motor at very short intervals oi time, say for instance, in bringing the elevator car to a stop at any floor and the car op erator will throw the car switch hand lever from one position to the other in an effort to make a good landing. injurious not only to the motor but also to the elevator apparatus and the controlling means. My invention prevents this rapid reversal by preventing the closure of the operating switch until such a time as the speed of the motor has fallen to a predeteu mined safe limit when the motor may be reversed with safety and without any injurious etlects upon the elevator apparatus. This device is also automatic in operation and does not depend upon the knowledge or discretion i the car operator.

I-desire not to be limited to the specific construction herein described, tor it is evident that those skilled in the art may make various changes without departing from th spirit or scope of the invention and may employ it in connections other than with do vator apparatus.

What I claim and desire to secure by Letters Patent of the United States, i

l. The combination of an electric motor, a circuit comprising a switch through which current is supplied to the motor, reversing switch mechanism, and a speed governor to prevent the closure of said switch after the reversing switch mechanism has operated during the running of the motor, until the speed of the motor has been reduced.

2. The combination of an electric motor, reversing switches, a switch in the motor circuit in series with said reversing switches. and means mechanically operated by the motor to prevent the closure of said switch while the motor is operating above a predetel-mined speed.

The combination of an electric motor, an electromagnetic switch in a supply circuit tor the motor, means to effect the closing of said switch, while the motor is operating below a predetermined speed, and means to prevent the energization of the switch magnet from said means while the switch is in open position and the motor rotating above a predetermined speed.

i. The combination of an electric motor. reversing switches therefor, an electromag netic switch in circuit with the reversing switches and having the circuit of its 12mg- This practice is very switch closing net winding controlled by the said switch, and means controlled by the speed ot the motor for maintaining a circuit for the said magnet winding independently of the said switch.

y 5. The combination of an electricmotor, an electromagnetic switch in the supply circuit for the motor, means operated by said switch for opening the circuit of the switch magnet whenthe switch has opened, and means controlled by the speed oi the motor for maintaining said magnet circuit independentl y of the said switch while the speed of the motor is below a predetermined value.

6. The combination of an electric a circuitconnecting the motor to a of current supply, an electromagnetic in said circuit, switch contacts carried by said switch and separated when the switch is open, said contacts being in the circuit of the switch magnet, a shunt circuit connected across said contacts, and means controlled by the speed of theimotor for opening said shunt circuit.'

'7. In an elevator, the combination of an electric motor, reversing switches, an electromagnetic switch in circuit with said reversing switches and the motor, contacts car ried by said electromagnetic switch and in circuit with the magnet winding of the switch, a shunt circuit across said contacts, and means operated by the motor for automatically maintaining the said shunt circuit open while the speed of the motor is above a predetermined value.

' 8. In elevator apparatus, the combination of a motor, an electro-responsive operating switch, circuit closing means joined to the motor, centrifugal means connected to the motor to aiitomatically operate the circuit closing means, and auxiliary contacts in connection with the operating switch to maintain a closed circuit through the operating switch magnetwinding.

S). In BlEVjfltOl apparatus, the combination of a motor; circuit closing means joined to the motor, an electro-responsive operating switch, a manual switch for 'iitially energizing and'for deenergizing the operating switch, and centrifugal means joined to the motorto prevent the reenergization of the operating switch after the motor has been started until the speed thereof fallsto a certain limit. i

10. In elevator apparatus, the combination 'of an alternating current motor, an electro-responsiv e operating switch, contacts motor, source in connection with the motor to close a cir- 80 cuit through the magnet winding of the operating switch, means in connection with the operating switch to maintain an energizing circuit through the said winding when the switch is closed, and means dependent upon the speed of the motor to prenuance-"z switch rent the magnet circuit from being closed when the speed of the motor exceeds a prescribed limit,

11, In elevator apparatus, the combination of a motor, contacts fixed to the motor housing, a contact ring to connect the said contacts, a centrifugal device joining the contact ring to rotating part of the motor, reversing switches for the motor, an electromagnetic operating switch having auxiliary contacts for maintaining a circuit through the operating switch magnet winding while the switch is closed, and a car switch for initially closing and for opening energizing 13. In elevator apparatus, the combination of a singlephasc repulsion-induction motor having a centrifugal short-circuiting device, a contact device operated by the centrifugal device, reversing switches for the motor, and means in connection with the switches and the contact device for preventing the said motor circuits from being reversed until the speed of the motor is reduced.

it. In elevator apparatus, he combination of a single-phase repulsion-induction motor having a centrifugal short-circuiting device for automatically changing the motor from a repulsion to an induction motor, a contact device operated by and simultaneously with the short-circuiting device, and means in connection with the said contactdevice to prevent the reversal of the motor.

15. In an elevator apparatus, the combination of a single'phase repulsion-induction motor having a centrifugal short-circuiting device mounted on the motor to change it from a repulsion to an induction motor when the motor speeds up, an elevator car switch, reversing switches for the motor controlled from the car switch, an operating switch, a contacting device operated by the centrifugal short-oircuiting device and operative simultaneously with the said operating switch to prevent the energization of the motor in a reverse direction to which it is operating until the speed of the motor has been reduced. l

1b. In elevator apparatus, the combination or a singlephase repulsion-induction motor having a centrifugal short-circuiting i switch and the said Contact device to prevent;

device, a Contact device operated by the cen magnet winding to open the corresponding 10 i trifugai device, reversing switches for the l rmversing switch. 1 motor, an elevator cm switch for energizing In testimony whereof, I have signed my 1 the reversing switches, an operating switch, name he this specification in the presence means in connection with the operating of two subscribing Witnesses.

% DAVID L LINIDQUEST.

the reversal of the motor from the car} switch VVifinesses:

until the motor has been stopped, and alimit GEORGE lhion, switch in series with each reversing switch ,1 V EDWARD ii.

Go ies of this atent ma be obtained fer five cents each, bv P v c Washington, I 53. 

